I have found out that the prm4031 face with the writing on it can
get damaged with use , I have some clear cover plexiglass for this
radio it will snap into place very nice too, photo will be in the
file section of racal-manpack, please email me at
armygear@... if you have a radio like the 4031 and you want
to protect its writing on the face.

battery box needed for prm-4031, I need a battery box ,really dont
need the battery but both ways are ok part # for racal batterys boxs
are MA 4025B and 4025A, Iam also looking for a RACAL 5.4 mast
MA.2231 . If you have any of these please email me at
armygear@... or if you can tell me who could have them let
me know, seem like the racal older items are far apart coming up on
auction on ebay but I will keep looking.

Many of our sets have been purchased on the surplus market.
Mine was "captured" by me . I suppose it "belongs" to some foreign
government but they are not getting it back.
How about yours?
Are there any tales worth hearing here?
Jim VE3DDY

I have a PRM-4090 that receives with the sensitivity one would expect, but does not transmit. All i get are beeps on the earpiece. Is there anything tricky about settings on the front panel? Does anyone have at least a schematic?

Hi All
Beeing a new one to the group i seek assistance for finding a copy of
the schematics of the PRM 4051,mine beeing faulty.
Also does somebody Know the wiring of the 24 volts input connector on
the battery MA 3964B (12 volts model)not beeing made specially for
this PRM 4051/4031 it fits perfectly the radio.
Does anybody have a source for the antenna of the PRM?
Thanks in advance
Feyssac jacques

Despite what the ad says, this looks like a battery for the BCC39B if
anyone needs one.

eBay 3824867617

Howard, VK3DLH

No idea at all, Keith, and there is nothing remotely like it in my
Racal Antennas catalogue which is about eight years old, which
suggests it might be fairly recent.

It's nothing like my own MA.961 Tactical Loop in appearance. For the
record, the '961 is a square loop mounted on one corner. It sits on
top of a matching box which is approximately a 12 inch cube, which in
turn sits on top of two 1-metre fibreglass mast sections. The only
external connection is BNC for the attached transceiver. It comes in
one bag, containing the folded loop, the matching unit, two mast
sections, guys pickets, hammer, and a generous length of co-ax.

The 961 has a manual tuning knob and meter, plus a link which sets it
to the upper or lower part of it's HF coverage. The peak in tuning,
either on the meter or on received noise, is very sharp.

I'll see if I can get a Racal model number from Mike at CR for this
new one. Presumably the 7-pin connection suggests the matching unit
in it is automatic.

Bob

--- In Racal-manpacks@..., "Keith-Watt RN \(Rtd.\)"
<keith-watt@b...> wrote:

Hi, has anyone come across the Racal/Clansman HF antenna shown on

this WEB page, if so what exactly is it and how does one use it?

Thanks,
Keith Watt RN (Rtd.)

开云体育

BCC39 ATUs are showing up as surplus on that "e" place. Someone in the UK has figured out the following so far. Just an fyi.

I have unravelled the program and understand most of what it does at a software/hardware level,
and I am planning a simple "tune initiate" circuit to add on to the
unit and supply it with power and auto-tune commands. It needs 5volts
on the coax to the BNC connector, but this is supplied from the BCC39
24volt supply rail by a dropper resistor and RF blocking RFC etc. The
command bits are inserted by brief interruptions to the supply, using a
FET in the TCVR to pulse width modulate a signal which is picked up
by the interrupt lines on the MPU in the tuner. It tunes in about
300 mSec, and I have had very good reports using quite short wires
from the BCC39 I was lent.

--- In Racal-manpacks@..., Brooke Clarke <brooke@p...>
wrote:

The other convention is to specify the band center of the SSB
transmission. The idea is that you are only transmitting a signal

in

some band and the signal energy depends on the modulation, so just
specify the band center. I think this is how the ham 60 meter

frequency

is specified in the regs and that's why we need to tune to 5371.5

kHz

instead of 5370 kHz, i.e. to get the transmitted signal into the
specified band.

Hi,

if I remember correctly this is called "The Assigned Frequency"

and works very well with the idea of channelisation rather than any
idea of carrier frequency.

Michael

Hi:

I recently was learning about this in relation to the PRC-104.

If a transmitter is in SSB mode and you press the mike PTT without any speech audio input there is no RF output.
In the PRC-104, PRC-74 and I'm sure many other radios there is a seperate CW keying line. When this line is grounded the radio inserts an audio tone into the SSB channel causing a single RF frequency to be transmitted. The actual RF frequency transmitted depends on the frequency of the audio tone, whether in USB or LSB mode and the RF frequency set into the radio.

There are two conventions for specifying the RF frequency of a SSB transmission. One is to specify the frequency of the missing carrier, which is the same as the carrier of an AM signal with the same side bands. If you use this convention and tune an AM signal then switch the receiver into LSB, USB or AM modes, in all cases you will hear the signal. This is the convention used on the PRC-104. You can hear the USB or LSB WWV transmissions by just switching modes.

The other convention is to specify the band center of the SSB transmission. The idea is that you are only transmitting a signal in some band and the signal energy depends on the modulation, so just specify the band center. I think this is how the ham 60 meter frequency is specified in the regs and that's why we need to tune to 5371.5 kHz instead of 5370 kHz, i.e. to get the transmitted signal into the specified band.

You will not hear a CW signal on a radio in AM mode. You need a BFO offset from the RF (or IF) CW frequency by the audio frequency you want the radio to produce when the CW signal is present. So you may need to adjust the BFO frequency on the 703.

73,

Brooke Clarke, N6GCE

One of the UK surplus sellers has BCC-39 extender controllers. I do not know what it is exactly, but go the following link and, after clicking on the door, click on the left hand horizontal bar labeled (label pops up when you put the cursor on the bar) radio ancills. Click on its picture to see a larger view. He says he has one, but can get more. I did not get a price. He also has BCC-39 antenna tuners.

The usual CW thing with Racal is to put a keyed 1 kHz tone into the ssb input. So if you are on, say, a dial frequency of 7040 kHz with USB the cw will actually be on 7041, and with lsb it will be on 7039. To complicate matters the clarifier will give you a variation of + or - 500 Hz as well. A few of the TRA931s were fitted with offset CW filters to make them a better CW radio but the same thing applies.

73 Dan ac6ao / g3ncr

seem like my key wasnt wire right for my racal , it was on PTT and
GROUND, changed it to KEY and ground now it works great on USB/CW
and LSB/CW , but there is something I really dont understand CW on
the AM mode on the racal will only pickup on CW mode on the icom 703
radio cant hear it much on the AM mode on the 703, The only thing I
can think is that the racal set can tell someway if it is voice or a
key being used or could be that my 703 has a band filter of .500 for
CW and a 6.0k for AM ,thinking that the 6.0k is too much to hear the
code in the AM mode on the 703 icom. any feedback on this is
welcomed

my racal prm4030 manpack it has a usb/cw and a lsb/cw and am on the
knob, just got a key for this rig and was trying it out with my icom
703 want to see what the tone sounded like , all I get in usb/cw
and lsb/cw mode is a short duration tone not sure what its doing
but keep in mind my icom 703 willnt do cw/usb just cw and Am mode,
that could be the problem not sure? I know that it sounded great on
am mode. not really sure what that usb and lsb CW mode is in the
military sets.

Hi, All,

I've added a Link on the Web site to Service-Manuals.net, who have a
limited number of manuals and operating instructions for Racal
tactical gear.

Both they and Telford Electronics are currently offering manuals for
the TRA.931, which may be a more generic copy than the one available
from Mauritron, which is actually for the "XH" model.

best regards,


Bob

For those of you who made your own PRC-2000 battery, what did you use for battery clips to connect to the battery box pins?

Hello Jim,

It maybe that "TR48s" was the original SA designation. My set came

I have heard of other radio made by Racal SMD with the TR designation. I
didn't know they had one for the Syncal 30. Racal South Africa later
became Grinaker, then Grintek. Grinaker equiment was marketed
internationally under the Milcom name.
There is a little bit of the company history here:

and here:

It has some interesting antenna accessories one of which is a large
bobbin type spool that has a cord wound on it. The cord has a
multiple wire woven into it. You just spool out the cord, throw its
washer type weight over a tree limb and plug the pin on the end of
the spool into the antenna whip hole.

It would be interesting to see a picture of the antenna

I have had a few TRA931 sets. It is one of my favorites.


Tom Bryan
N3AJA

Hi, Guys,

I've just found another reference to early Racal
history in "Radio Bygones" for Oct/Nov 1993, in an
article called "Racal and the RA.17 HF Communications
Receiver", by Keith R. Thrower, who I believe worked
for the company (I stand to be corrected on that!).


"... Ray, Raymond Brown, and Cal, George Calder (Jock)
Cunningham established Racal Ltd. in 1950. This led
to the formation of Racal Engineering Ltd. in 1951 and
a move to a 5000 square-foot building in Isleworth,
near the London Airport.

Early in 1953, Racal hoped to acquire the rights to
manufacture in Britain the new Collins 51-J HF
communications receiver. On the basis of this, Racal
was awarded a contract with the Royal Navy for the
supply of 200 of these receivers. For the manufacture
of the Collins receiver, Racal proposed to use a
substantial portion of British components.
Unfortunately, Collins insisted that only US
components be used, and after a visit to Racal's
primitive facilities at Isleworth, Collins decided
that Racal was too small to undertake manufacture of
the radio, which was probably true at that time.

The problem facing Racal was to produce a receiver
with the same general characteristics as the Collins
sets to fulfill their Royal Navy contract.

Meanwhile, in South Africa, Dr. Trevor Wadley, who had
worked for the Telecommunications Research
Establishment in England during the war, was
developing a communications receiver based on an
extremely accurate and elegant frequency control
scheme that he had developed for use in test
equipment. Racal and Wadley eventually got together.
The result was one of the world's great communications
receivers. The design work on the RA.17 was started in
late 1954, and production continued at least until
1967 ..."



best regards, Bob









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